Difference between revisions of "Mobile Communications"
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===Brief summary=== | ===Brief summary=== | ||
| − | {{BlueBox|TEXT=The book | + | {{BlueBox|TEXT=The book »Mobile Communication« deals with the essential differences compared to systems for the fixed network, when transmitters and/or receivers are moving. Thus, intersymbol interference is not caused by frequency dependence of the medium »electrical line« or »optical fiber», but by multipath propagation due to reflections, resulting in constructive or destructive superpositions of the electromagnetic wave with its echoes. Here are some of the topics covered: |
# Time-variant transmission channels: Distance-dependent attenuation, shadowing, Rayleigh fading $($at line-of-sight$)$, Rice fading $($without line-of-sight$)$. | # Time-variant transmission channels: Distance-dependent attenuation, shadowing, Rayleigh fading $($at line-of-sight$)$, Rice fading $($without line-of-sight$)$. | ||
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<u>Notes:</u> | <u>Notes:</u> | ||
| − | *Many of the fundamentals covered in the book | + | *Many of the fundamentals covered in the book »[[Signal Representation]]« are still valid. Differences arise from the radio channel, which is mostly time-varying. |
| − | *More detailed descriptions of second and third generation mobile radio systems $($GSM, UMTS$)$ can be found in the book [[Examples_of_Communication_Systems| | + | *More detailed descriptions of second and third generation mobile radio systems $($GSM, UMTS$)$ can be found in the book [[Examples_of_Communication_Systems|»Examples of Communication Systems»]]. |
*It should be noted, however, that their importance today $($2023$)$ is no longer very great; in some countries GSM and UMTS have already been switched off. | *It should be noted, however, that their importance today $($2023$)$ is no longer very great; in some countries GSM and UMTS have already been switched off. | ||
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Latest revision as of 13:27, 3 April 2023
Brief summary
The book »Mobile Communication« deals with the essential differences compared to systems for the fixed network, when transmitters and/or receivers are moving. Thus, intersymbol interference is not caused by frequency dependence of the medium »electrical line« or »optical fiber», but by multipath propagation due to reflections, resulting in constructive or destructive superpositions of the electromagnetic wave with its echoes. Here are some of the topics covered:
- Time-variant transmission channels: Distance-dependent attenuation, shadowing, Rayleigh fading $($at line-of-sight$)$, Rice fading $($without line-of-sight$)$.
- Frequency-selective transmission channels: Two-dimensional impulse response and transfer function, multipath reception in mobile radio, GWSSUS model.
- Second and third generation mobile radio systems: Characteristics of GSM $\rm (2G)$ and UMTS $\rm (3G)$, Similarities between the two, further developments.
- The 4G–LTE mobile standard $($"Long Term Evolution"$)$, similarities and differences between "OFDMA" $($e.g. at DSL$)$ and "OFDMA" $($e.g. at LTE$)$.
Notes:
- Many of the fundamentals covered in the book »Signal Representation« are still valid. Differences arise from the radio channel, which is mostly time-varying.
- More detailed descriptions of second and third generation mobile radio systems $($GSM, UMTS$)$ can be found in the book »Examples of Communication Systems».
- It should be noted, however, that their importance today $($2023$)$ is no longer very great; in some countries GSM and UMTS have already been switched off.
⇒ Here first a »contents overview« based on the »four main chapters« with a total of »sixteen individual chapters« and »121 sections«.
Content
Exercises and multimedia
In addition to these theory pages, we also offer exercises and multimedia modules on this topic, which could help to clarify the teaching material:
$(1)$ $\text{Exercises}$
$(2)$ $\text{Learning videos}$
$(3)$ $\text{Applets}$
Further links
